Maintain initial data resolution in control loop.

[iago-mendes]

Proposed changes

This PR ensures that the control loop uses the resolution specified in the first initial data run. Before, it was incorrectly using the default resolution (L=1, P=6).

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Code review checklist

• The code is documented and the documentation renders correctly. Run
  make doc to generate the documentation locally into BUILD_DIR/docs/html.
  Then open index.html.
• The code follows the stylistic and code quality guidelines listed in the
  code review guide.
• The PR lists upgrade instructions and is labeled bugfix or
  new feature if appropriate.

Further comments

[knelli2]

Oh looks like you need to update the tests as well